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New Scientist Live

Enigma Number 1650

Some prime magic

By Gwyn Owen

The diagram on the right is a magic square in which the letters A, B, …P, Q each represent a positive whole number not exceeding 200. Taken together, the 16 letters form, in some order, an arithmetic sequence of 16 terms. The letters E, N, I, G, M and A form, in that order, an increasing arithmetic sequence of six prime numbers.

A B N C

D F H G

M J E K

L I P Q

Find the product C × H × J × L.

WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 13 July. The Editor’s decision is final. Please send entries to Enigma 1650, New Scientist, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).